Power loaders



Oct. 18, 1955 R BEYERSTEDT ETAL 2,720,990

POWER LOADERS 5 Sheets-Sheet 1 Filed Sept. 15, 1954 INVENTOR. RALPH L. BEYERSTEDT ERNEST R. CUNNINGHAM JR.

ATTORNEY Oct. 18, 1955 R. L, BEYERSTEDT ETAL 2,720,990

POWER LOADERS Filed Sept. 15, 1954 3 Sheets-Sheet 2 NVEN TOR.

I RALPH L. BEYERSTEDT ERNEST R. CUNNINGHAM JR.

BYQLL/QQ/QW ATTORNEY Oct. 18, 1955 R. L. BEYERSTEDT ETAL 2,720,990

POWER LOADERS Filed Sept. 15, 1954 3 Sheets-Sheet 3 INVEN TOR. RALPH L. BEYERSTEDT ERNEST R. CUNNINGHAM JR.

BYHQJQQW ATTORNEY United States Patent POWER LOADERS Ralph L. Beyerstedt and Ernest R. Cunningham, Jr., Libertyville, 11L, assignors to The Frank G. Hough Co., a corporation of Illinois Application September 15, 1954, Serial No. 456,186 20 Claims. (Cl. 214-510) This invention relates generally to front end power loaders, and more specifically to novel bucket arrangements for front end power loaders.

As is well known in the art, front end power loaders are generally comprised of prime mowers such as a rubber-tired or crawler tractor, a bucket disposed forwardly of the prime mower, and boom and linkage means operatively interconnecting the bucket and the prime mower. Various means have been provided, under control of the operator of the loader, for operating the boom and linkage means to in turn control the various necessary operations of the bucket such as digging, carrying, dumping, bulldozing, spreading and back-filling of any material commonly worked by such a loader.

Power loaders, as now known in the art, are not capable of performing all of the noted functions with the desired or with substantially equal efficiency. Among the most troublesome functions, which have resulted in decreased overall efiiciency of power loaders, have been the functions of digging, dumping, and bulldozing. The digging function is often poorly performed when hard packed materials must be worked, since excessive clutch slippage or tire wear then results. The dumping function is often poorly performed since when sticky materials are worked there is a tendency of the material to adhere to the inner walls of the bucket when the bucket is operated to a dump position. Further, the dumping height and reach is often considerably reduced when the bucket is pivoted about its lower rear portion to a dump position, as is common in the art. The function of bulldozing is often poorly performed since the buckets generally known in the art cannot be adjusted to present an ideal bulldozing blade surface to the material to be worked. Therefore, it is the object of this invention to provide a bucket arrangement for a front end power loader which will efiiciently perform all of the noted functions including those with which difliculty has been experienced in the art.

A feature of the present invention is the novel construction of a bucket having an ejector mechanism.

Other objects and features of the present invention will be apparent upon a perusal of the following specification and drawings, of which:

Figure l is a side plan view of a power loader constructed according to the present invention with the bucket in one operated position;

Figure 2 is a partial side plan view of a portion of the invention shown in Figure l with the bucket in another operated position;

Figure 3 is a partial side plan view of the invention shown in Figure 1 with the bucket in a third operated position;

Figure 4 is a side plan view of the structure shown in Figure 1 with the boom and linkage means raised to a high lift position and the bucket in one operated position;

Figures 5 and 6 are partial side plan views of the structure shown in Figure 4 showing the bucket in other operated positions.

The present embodiment is the preferred embodiment but it is to be understood that changes can be made in the present embodiment by one skilled in the art without departing from the spirit and scope of this invention.

For a detailed description of the present invention, reference is made to the drawings. The loader comprises a vehicle 10 of any type well known in the art. Although vehicle 10 shown in the drawings is a rubber-tired vehicle, a crawler type tractor may also be used.

A boom 11, formed in duplicate portions positioned on each side of the vehicle 10, is pivotally mounted at one end thereof to the vehicle 10 by means of mounting means 12. The other end of the boom 11 is disposed forwardly of the vehicle 10 and is formed to have a substantially vertical downwardly extending portion. The downwardly extending portion of the boom 11 is concave looking toward the front of the vehicle 10, as can easily be seen in the drawings. A hydraulic ram 13 is provided for raising and lowering of the boom 11. The head end of the hydraulic ram 13 is pivotally mounted to the vehicle 10 through a bracket 14 and pivotal mounting means 15. The rod end of the hydraulic ram 13 is pivotally mounted to the boom 11 intermediate the ends thereof by a bracket 16 and pivotal mounting means 17. The hydraulic ram 13, the brackets 14 and 16 and the pivotal mounting means 15 and 17 are formed in duplicate portions disposed on each side of the vehicle 10, with the bracket 14 rigidly mounted to the vehicle 10 and the bracket 16 securely mounted to the boom 11.

The linkage means of the present embodiment comprises a link 18 formedjn duplicate portions disposed on each side of the vehicle 10. One end of the link 18 is pivotally mounted to the vehicle 10 by means of mounting means 19. Pivotal mounting means 19 is positioned substantially vertically above the pivotal mounting means 12. The other end of the link 18 is positioned to extend forwardly of the vehicle 10. A U-shaped yoke 26 having a pair of legs interconnected by a cross member is also provided. The ends of the legs of the yoke 20 are pivotally connected to each portion of the boom 11 intermediate the ends thereof by means of mounting means 21. The forward ends of each portion of the link 18 are pivotally connected to the legs of the yoke 20 intermediate the ends thereof by means of mounting means 22. The link 18 is of such a length that when con nected as described and positioned as shown in Figure l, the pivotal mounting means 22 is substantially vertically above the pivotal mounting means 21.

The bucket of the present invention, which is somewhat more complicated than a simple bucket such as those well known in the art, comprises a generally U-shaped element having side walls 23 interconnected by a bottom wall 24. The side walls 23 have the conventional bucket configuration well known in the art, as can be seen in the drawings. The bottom Wall 24 is formed of two spaced apart elements having a concave configuration, when viewed from above, along an axis longitudinally of the vehicle 10. A cutting edge 25 is mounted to the forward edge of the bottom wall 24. The bucket further comprises an ejector element or plate 26. The ejector plate 26 is pivotally mounted along the upper marginal edge thereof to the upper marginal edges 0" the side walls 23 of the U-shaped element by means of mounting means 27. The ejector plate 26 is formed to have a concave configuration looking toward the front of the vehicle 10 along a vertical axis. The ejector plate 26 is further of a width substantially equal to the distance between the side walls 23. The upper element of the bottom wall 24 has a curvature substantially equal to that traced by the lower marginal edge of the ejector plate 26 when the ejector plate 26 is pivoted about mounting means 27. v

The bucket is mounted to the boom 11 and the linkage means through a pair of hydraulic rams 28 and 29 and a pivotal connection at the forward end of the boom 11. The hydraulic rams 28 and 29 may be of any type of double acting hydraulic rams well known in the art. The head end of the hydraulic ram 28 is pivotally mounted to the cross member of the yoke by means of pivotal mounting means 30. The rod end of the hydraulic ram 28 is pivotally mounted between a pair of flanges 31 by means of mounting means 32. The pair of flanges 31 are secured to the rear face or convex side of the ejector plate 26 intermediate the top and bottom edges thereof. It desired, the hydraulic ram 28 may be formed as two hydraulic rams mounted side by side to the cross member of the yoke 20 and mounted to two pairs of flanges on the convex side of the ejector plate 26. Each portion of the boom 11 is pivotally mounted to the lower rear marginal edge of the ejector plate 26 through two pairs of spaced apart flanges 33 and pivotal mounting means 34. It can thus be seen that if the hydraulic ram 13 is extended and retracted, with the hydraulic ram 28 contracted as shown in Figure 2, the boom 11 and the link 18 will be pivoted about their respective pivotal mounting means to raise and lower the ejector plate 26, while maintaining the ejector plate 26 in substantially vertical planes. The remainder of the bucket, the U-shapcd element having the side walls 23 and bottom Wall 24,'will follow the movement of the ejector plate 26 relative to the ground since the U-shaped element is pivotally mounted to the ejector plate 26 by pivotal mounting means 27. It can also be seen that the angle of any plane through the ejector plate 26 will be varied in relation to the ground as the hydraulic ram 28 is extended and retracted. To mount the hydraulic ram 29, a cylindrical beam and a bracket 36 are pro: vided. The beam 35 is secured between each portion of the boom 11 intermediate the ends thereof. The bracket 36 is secured to the beam 35 intermediate the ends thereof. The head end of the hydraulic ram 29 is pivotally mounted to the bracket 36 by means of mounting means 37. The rod end of the hydraulic ram 29 is pivotally mounted to the upper rear marginal edge of the bottom wall 24 by means of a pair of flanges 38 and pivotal mounting means 39. The pair of flanges 38 are secured in a spaced apart relations p to the upper rear marginal edge of the bottom wall 24 intermediate the ends thereof. Thus it can be seen that as the hydraulic ram 29 is caused to extend and retract, the U-shaped element comprising the side walls 23 and the bottom wall 24 is pivoted relative to the ejector plate 26. Hydraulic fluid conduits, controls and pump means (not shown) of any type well known in the art may be provided for operation of the hydraulic rams 13, 29 and 28.

Turning next to a detailed description of the operation of the instant invention, reference is again made to the drawings. For purposes of this description, the U-shaped element comprising the side walls 23 and the bottom wall 24 will be called the scoop of the bucket, and the element 26 has previously been defined as the ejector plate of the bucket. The subject loader may be operated to dig a great variety of different materials in a number of different manners. Firstly, the rams 28. and 29 can be retracted and the boom 11 positioned as shown in Figure 1. The vehicle 10 is then moved to bring the ejector plate against the material to be dug. The hydraulic ram 29 is then extended to cause the scoop to be forced into the material until the scoop reaches the position shown in Figure 2. The boom 11 may then be raised any desired amount to permit carrying of the loaded bucket. The loader may also be used to dig by initially operating the hydraulic rams 28 and 29 to cause the bucket to assume the position shown in Figure 2. In this position the hydraulic ram 28 is fully retracted and the hydraulic ram 29 is fully extended. The vehicle 10 is then moved into the material to be loaded and the boom 11 is raised to fill the bucket and to permit carrying the loaded bucket. Also, the angle at which the bucket is caused to dig into the material to be dug may be varied by extending the ram 28 any desired amount, such as is shown for example in Figure 3. Further, any combination of these described methods of digging may be used for materials too difficult to dig by the described methods. For example, should the material comprise a mixture 'such as gravel having large rocks therein, the loader may be moved to the material with the bucket positioned as shown in Figure 1, or with the hydraulic ram 28 partially extended,

and the hydraulic ram 29 may then be alternately expanded and retracted to loosen and work the gravel to permit any large rocks to be gradually worked into the bucket. By moving the loader as shown in Figure l against a hard packed material, by then braking the wheels of the loader, and by then expanding the hydraulic ram 29, the scoop may be power crowded into the material to fill the bucket, thereby eliminating any clutch slippage or excessive wear of the tires of the vehicle. The bucket may be carried in any position between that shown in Figures 2 and 4 by any desired degree of expansion of the hydraulic ram 13.

To dump the bucket from a position such. as shown, for example, in Figure 4, it is merely necessary to retract the ram 29 to the position shown in Figure 6. It can easily be seen that since the scoop is swept clean by the ejector plate, sticky materials maybe eifectively and efficiently dumped from the bucket. It can also be seen that as the scoop is pivoted from the position shown in Figure 4 to the position shown in Figure 6 by retraction of the ram 29, there is no appreciable reduction in the dumping height of the bucket. Thus the bucket may be dumped into a bin or truck wherein the height of the bin or truck is substantially equal to the distance from the ground to the bottom wall 24 of the scoop. The bucket as shown in Figure 4 may also be dumped by extension of the ram 28 to the position shown in Figure 5. This results in a forward tipping of the bucket to spill the material therefrom. Further, any combination of these described methods for dumping may be used for any special circumstances.

The subject loader may be efficiently used as a bulldozer by positioning the boom 11 and the bucket as shown in Figure 1. The ejector plate and the forward marginal edges of the scoop will then present a conventional bulldozer blade to the material to be bulldozed.

The loader may be efficiently used for the spreading of any material by gradually, dumping the material as the vehicle 10 is moved. This may be accomplished by retracting the ram 29 to any desired degree or by extending the ram 28 to any desired degree. Spreading of the material may also be accomplished by positioning the bucket and the boom 11 of the loader substantially as shown in Figure l, and by then extending the ram 29 to present any selected portion of the bottom 24 of the scoop to the material to be spread.

The subject loader may be efficiently used to backfill an excavation by moving the vehicle 10 with the bucket loaded and positioned as shown in Figure 2 to the edge of an excavation. As the hydraulic ram 29 is then retracted from the position shown in Figure 2 to that shown in Figure 1, the material will be dumped from the bucket into the excavation to accurately backfill the excavation. Again, backfilling may be accomplished by any desired degree of extension of the hydraulic ram 28 either alone or in cooperation with the retraction of the ram 29.

It must be noted that it isapparent from the above description of the operation of the loader that the loader Having described the invention, what is considered new and desired to be protected by Letters Patent is:

1. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, link means pivotally mountable at one end thereof on said vehicle, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally connected between the other end of said link means and said ejector plate for pivoting said bucket relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

2. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, link means pivotally mountable at one end thereof on said vehicle, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally connected between the other end of said link means and said ejector plate for pivoting said bucket relative to said boom, and a double acting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

3. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, link means pivotally mountable at one end thereof on said vehicle, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally connected between the other end of said link means and said ejector plate for pivoting said bucket relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

4. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, link means pivotally mountable at one end thereof on said vehicle, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally connected between the other end of said link means and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a second double acting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, a link pivotally mountable at one end thereof on said vehicle, a yoke pivotally mounted between the other end of said link and said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

6. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, a link pivotally mountable at one end thereof on said vehicle, a yoke pivotally mounted between the other end of said link and said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally mounted between said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

7. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, a link pivotally mountable at one end thereof on said vehicle, a yoke pivotally mounted between the other end of said link and said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a double acting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said coop element relative to said ejector plate.

8. in a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, a link pivotally mountable at one end thereof on said vehicle, a yoke pivotally mounted between the other end of said link and said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally mounted between said yoke and said ejector plate for pivoting said coop element and said ejector plate relative to said boom, and a second double acting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

9. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

10. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

11. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one endrthereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end ofeach portion of said link, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted Within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a double acting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

12. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a bucket comprising a substantially' U-shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a second doubleacting hydraulic ram pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

13. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a beam mounted between each portion of said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector platepivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said beam intermediate the ends thereof and 'said scoop element for pivoting said scoop element rela tive to said ejector plate.

14. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end'thereof on said vehicle, a U-shaped yoke comprising a pair of legs. interconnected by a cross piece, means pivotally. mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of 8 each portion of said link, a beam mounted between each portion of said boom intermediate the ends thereof, a bucket comprising a substantially U-shaped scoop element, and an ejector plate pivotally mounted within said a .scoop element, the other end of said boom pivotally mounted to said ejector plate, a double acting hydraulic ram pivotally mounted between the cross piece of said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and

10 a second double acting hydraulic ram pivotally mounted between said beam intermediate the ends thereof and said scoop for pivoting said scoop element relative to said ejector plate.

15. In a loader having a vehicle, a boom pivotally mountable at one end thereof on said vehicle, link means pivotally mountable at one end thereof on said vehicle, a bucket comprising a scoop element having a pair of side walls interconnected by a bottom wall, the forward edge of said bottom wall being provided with a cutting edge, an ejector plate having a width substantially equal to the distance between said side walls of said scoop, means for pivotally mounting said ejector plate within said scoop element at the upper marginal edges of the side walls thereof, the bottom wall of said scoop element having a curvature substantially equal to that traced by the lower marginal edge of said ejector plate, means pivotally mounting the other end of said'boorn substantially at the lower marginal edge of said ejector plate, means pivotally connected between the other end of said link means and the rear face of said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said bottom wall of said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

16. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one intermediate the ends thereof to the other end of each portion of said link, a bucket comprising a scoop element having a pair of side walls interconnected by a bottom wall, the forward edge of said bottom wall being pro vided with a cutting edge, an ejector plate having a width 0 substantially equal to the distance between said side walls of said scoop, means for pivotally mounting said ejector plate within said scoop element at the upper marginal edges of the side walls thereof, the bottom wall of said scoop element having a curvature substantially equal to 5 that traced by the lower marginal edge of said ejector plate, means pivotally mounting the other end of said boom substantially at the lower marginal edge of said ejector plate, means pivotally connected between the cross piece of said yoke and the rear face of said ejector plate for pivoting said scoop elementeand said ejector plate relative to said boom, and means pivotally mounted between said bottom wall of said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

17. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the endsthereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a bucket comprising a scoop element having a pair of side walls interconnected by a bottom wall, the forward edge of said bottom wall being provided with a cutting edge, an ejector plate having a width substantially equal to the distance between said side walls of said scoop, means for pivotally mounting said ejector plate within said scoop element at the upper marginal edges of the side walls thereof, the bottom wall of said scoop element having a curvature substantially equal to that traced by the lower marginal edge of said ejector plate, means pivotally mounting the other end of said boom substantially at the lower marginal edge of said ejector plate, a double acting hydraulic ram pivotally connected between the cross piece of said yoke and the rear face of said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a second double acting hydraulic ram pivotally mounted between said bottom wall of said scoop and said boom for pivoting said scoop element relative to said ejector plate.

18. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a beam mounted between each portion of said boom intermediate the ends thereof, a bucket comprising a scoop element having a pair of side walls interconnected by a bottom wall, the forward edge of said bottom wall being provided with a cutting edge, an ejector plate having a width substantially equal to the distance between said side walls of said scoop, means for pivotally mounting said ejector plate within said scoop element at the upper marginal edges of the side walls thereof, the bottom wall of said scoop element having a curvature substantially equal to that traced by the lower marginal edge of said ejector plate, means pivotally mounting the other end of each portion of said boom in a spaced apart relationship substantially at the lower marginal edge of said ejector plate, means pivotally connected between the cross piece of said yoke and the rear face of said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said beam intermediate the ends thereof and said bottom wall of said scoop element for pivoting said scoop element relative to said ejector plate.

19. In a loader having a vehicle, a boom comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, in link comprising duplicate portions disposable on each side of said vehicle and pivotally mountable at one end thereof on said vehicle, a U-shaped yoke comprising a pair of legs interconnected by a cross piece, means pivotally mounting the end of each leg of said yoke to one of said portions of said boom intermediate the ends thereof, means pivotally mounting the legs of said yoke intermediate the ends thereof to the other end of each portion of said link, a beam mounted between each portion of said boom intermediate the ends thereof, a bucket comprising a scoop element having a pair of side walls interconnected by a bottom wall, the forward edge of said bottom wall being provided with a cutting edge, an ejector plate having a width substantially equal to the distance between said side walls of said scoop, means for pivotally mounting said ejector plate within said scoop element at the upper marginal edges of the side walls thereof, the bottom wall of said scoop element having a curvature substantially equal to that traced by the lower marginal edge of said ejector plate, means pivotally mounting the other end of each portion of said boom in a spaced apart relationship substantially at the lower marginal edge of said ejector plate, a double acting hydraulic ram pivotally connected between the cross piece of said yoke and the rear face of said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and a second double acting hydraulic ram pivotally mounted between said beam intermediate the ends thereof and said bottom wall of said scoop element for pivoting said scoop element relative to said ejector plate.

20. In a loader comprising a vehicle, a boom, means pivotally mounting said boom at one end thereof on said vehicle, a link, means pivotally mounting said link at one end thereof substantially vertically above said first means on said vehicle, a yoke, means pivotally mounting said yoke to said boom intermediate the ends thereof, means pivotaHy mounting said yoke to the other end of said link substantially vertically above said last mentioned means, a bucket comprising a substantially U- shaped scoop element, and an ejector plate pivotally mounted within said scoop element, the other end of said boom pivotally mounted to said ejector plate, means pivotally mounted between said yoke and said ejector plate for pivoting said scoop element and said ejector plate relative to said boom, and means pivotally mounted between said scoop element and said boom for pivoting said scoop element relative to said ejector plate.

No references cited. 

